Improvement in rests for hardening and tempering circular saws



A. SCHULTE.

Rest for Hardening'and Tempering Circular-Saws.

No.168,927. vPatented0ct.19,1875.

Mb I @awm I i NJEFERS. PHOTO-LITHOGRAPHER, WASHINGTON D. C.

UN TED STATES PATENT OFFICE.

ANTHONY SOHULTE, OF ST. LOUIS, MISSOURI.

IMPROVEMENT IN RESTS FOR HARDENING AND TEMPERING CIRCULAR SAWS.

Specification forming part of Letters Patent No. 168,927, dated October19, 1875; application filed July 6, 1875.

To all whom it may concern:

Be it known that I, ANTHONY ScHUL'rE, of St. Louis, Missouri, haveinvented a new and useful Rest for Hardening and Tempering CircularSaws, of which the following is a full, clear, and exact description,reference being bad to the annexed drawing making part of thisspecification, where Figure 1 is a sectional elevation on the line newof Fig. 2, and Fig. 2 a-plan.

Like letters indicate like parts.

In making circular saws a principal feature is the tempering. For thispurpose the saw is heated in a reverberatory furnace, and while in thefurnace it has been customary either to let the saw rest immediatelyupon the furnacebottom, or upon some rude support, which, in turn, restsupon the furnace-bottom. As a consequence, the saw, instead of beingheated exclusively by the hot air or flame acting directly upon the saw,is heated partly by coming in contact with the furnace-bottom, or by theheat of the bottom being conducted through the support described. As thebottom of such a furnace is apt to be uneven, the saw, whether restingimmediately upon the furnace-bottom or upon such a support as mentioned,heats unequally, which is objectionable; further, owing to the unevenaction of the furnace flame, it is necessary to turn the saw around andover from time to time, so as to present all parts of it evenly to theflame. This operation, by reason of the conditions above stated, istroublesome, and frequently unsuccessful.

To overcome these difficulties, and to provide means whereby a circularsaw can be heated uniformly in a reverberatory furnace and be easilyhandled therein, is the aim of the present invention.

In the drawing annexed, A represents a device or rest, consisting of acircular rim, B, of suitable size, provided with arms 0 G O 0, extendingfrom the rim inward, and slightly downward to its central point, D. Thismakes the center D a pivot, upon which the device rests and turns. Erepresents a post or guide arranged on the upper side'of the rest at itscenter, and extending a little above the level of the rim. F F representrollers journaled in the rest on either side of its center, and adjustedso as to come slightly below the lower edge of the rim, but above thepivot D.

In operation the saw is placed on the rest,

its eye passing over the post E, which serves to hold the saw in place,and the rest, in turn, placed on the furnace-bottom. The saw is thussupported in the furnace in such manner as to enable the hot air orflame of the furnace to come freely underneath it, and, owing to thepivot being the only part coming in contact with the furnace-bottom, noappreciable excess of heat is conducted through the rest to the saw fromthe furnace-bottom further, by rotating the rest on its pivot, the sawcan be readily presented in any desirable way to the flame. 1n passingthe saw into and out of the furnace the rest is tilted, so as to causeone of the rollers to bear on the furnace-bottom, and thus enable therest bearing the saw to be rolled over the furnace-bottom.

While I prefer a rest constructed with an outer circular rim, as shown,it is apparent that a construction in the shape of a spider-- 6.,several radiating arms, without a rim connecting their outer ends-wouldlargely answer my present purpose.

It is also manifest that, so far as supporting thesaw in the furnace insuch Way as to practically prevent any conduction of heat from thefurnace-bottom is concerned, the rim alone, if made thin, would be ofgreat value.

Having described my invention, what I claim as new therein, and desireto secure by Letters Patent, is

- 1. The combination of the rim B, arms 0 G O 0, post E, and pivot D,substantially as described.

2. The combination of the arms U G G 0, post E, and pivot D,substantially as described.

3. The combination of the arms 0 O O O, rim B, and post E, substantiallyas described.

4. The combination of the. arms 0 G G G, pivot D, and rollers F F,substantially as described.

5. The combination of the rim B and rollers F F, substantially asdescribed;

6. The combination of the arms 0 O G O and rollers F F, substantially asdescribed.

7. The combination of the rim B, arms 0 O A O G, rollers F F, pivot D,and post E, substantially as described.

ANTHONY SGHULTE. Witnesses:

CHAS. D. MOODY, M. J. G. VANORSTRAND.

